001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.transport.protocol;
018
019/**
020 *
021 *
022 */
023public class MqttProtocolVerifier implements ProtocolVerifier {
024
025    /* (non-Javadoc)
026     * @see org.apache.activemq.broker.transport.protocol.ProtocolVerifier#isProtocol(byte[])
027     */
028    @Override
029    public boolean isProtocol(byte[] value) {
030        boolean mqtt311 = value[4] == 77 && // M
031                value[5] == 81 && // Q
032                value[6] == 84 && // T
033                value[7] == 84;   // T
034
035        boolean mqtt31  = value[4] == 77  && // M
036                        value[5] == 81  && // Q
037                        value[6] == 73  && // I
038                        value[7] == 115;   // s
039
040        return mqtt311 || mqtt31;
041    }
042
043
044
045}